Brake.



No. 846,-4&1. 1

- PATENTED MAR. 12, 1907. VAN BUREN LAMB.

- Fig. 2

a) g A Tram/E Y5.

VAN BU LAMB. BR E.

PATENTED MAR. 12, 1907.

No. 846,481. PATENTED MAR. 12, 1907 VAN BUREN LAMB; BRAKE.-

APPLIOATION FILED 0OT.'6, 1905.

s sums-511mm.

Fig. 11.

LWt-maooeo UNITED STATES PgiENT OFFICE.

VAN BUREN LAMB, or NEW HAVEN, CONNECTICUT, Assreuori To KEYSTONE "BRAKE-SHOE COMPANY, or NEW YORK, N. Y., A CQBPORATION or NEW YORK.

BRAKE.

I Specification of Letters Patent.

Application filed October 6,1905 Serial No. 281,596.

ratented. March 12, 1907.

To all whom it may concern:

Be it known that I, VAN BUREN'LAMB, residing at New Haven, in thecounty of New Haven. and State of Connecticut, have invented certain new and useful Improvements in Brakes, of which the following is a full,

. clear, and exact description, such .as will enable others skilled in the art to which it appertains to make and use the same.

'ihis invention relates to brakes, and more especially to friction-brakes designed to be brake-head and attached to the wearing,

face of a new shoe in such manner that the material of theformer may be completely usedup. i

Other objects will be in part obvious and in part pointed out hereinafter. I

The invention accordingly consists in the features of construction, combinations of elements, and arrangement of parts, which will be exem lified in the construction hereinafterjdescribed and the scope of, the application of which will be indicajted in the ol lowing claims.

In the accom anying drawings, wherein is shown one o the various possible embodiments of m invention, Figure 1 is a yertical sectiona view of a brake'head. and Fig. 2 is a rear shoe on line a a of- Fig. 2. elevation of the brake-head. Fig. 3 is a horizontal section on line b b of Fig. 1, showing a shoe seated looselyin the brakehead.

Fig. 4 is a similar view on line 0 c, Fig. 1. Fig. 5 is a similar view showing aworn shoe in position upon the face of a new shoe. Fig. 6 is a view in elevation of the face of the brake-head. Fig. 7 is a similar View of the rear face of a brake-shoe. Fig. 8 is a similar view of the, front face thereof. Fig. 9 is a view in perspective of a brake-head and an attached, shoe. Fig. 10 is a similar view of a brake-shoe. Fig. 11' is a view in section showing a slightly difi'erent embodiment of retainingwedge. l

Similar reference characters refer to s1m1-' lar parts throughout the several views of the drawings.

Preliminary to a description of the specific features of my inventionand as con- 7 ducive to a clearer understanding of the more important objects thereof, it may here be noted that agreat source of loss in the use of brake-shoes as heretofore constructed" resides in the necessity of scrapping the worn portions of old shoes when the w caring surfaces thereof have. approached through wear into proximity to the brakerheac's. Moreover, one of the: chief sources of loss, aside from wasted. material, has been caused by the time consumed-in the operation of.

detaching worn shoes from the brake-heads and replacing them with new ones. eliminating the losses above s ecified and in provi3ing for the savingof 0th time and material I have found it desirable therefore to construct a braking member such that when worn it may readily be detached from the brake-head and attached to a new braking ber, thus allowing the utilizationof all-the 'material thereof for braking purposes I have,'moreover, found it desirable to provide means for connecting the bra-kin members tained firm y in a fixed relation in all stages of wear, the connecting means being so constructed that the braking members may. be

head without disturbirg the adjustment of thebrake-beam. The above defects are remedied, and, among others, the advantages above specified are securedin constructions of the nature'of that hereinafter described.

Referring now to the drawin s, 1v denotes a l y an integral I lug 3 having an opening 4 to receive the supporting-link. It may at this point be noted, however, that the construction of the rear securely together, so that they wi lbe mainconnected with each o tl eror with the brakeface of brake-head, or the number of at-- taching members orlugs, or their relative arrangement thereon formno part' of my present invention, being merely shown herein in cidentally. The head, in so far as its attaching features are concerned, may be of-any'.

desired construction, such construction depending, of course, u on the particular style of rake-beam upon w .ich it is to be mounted. The face 5 of brake-head 1 is constructed 152 member, the latter being interposed between the brake-head and the worn braking menuupon an arc of a circleequafgto that de'scribed 1 by the radius describing the circumference of d the tread of the wheels upon which the braking members operate, theradius of the arc of 5 face 5 being also equal to the radius describ-f ing'the front and rear faces of the coacting braking member. Face 5 is adapted to receive the rear face of a'braking member, as shown in Figs. 3, 4, and 5. Located in face 5 of brake-head 1 is a longitudinally-extend ing mortise 6 of substantially dovetailed shape and havin its greatest width and depth at its mid le portion, (indicated by the line d d of Fig. 5.) The walls of mortise 6 converge in every direction downwardly from its middle portion toits lower closed end 7, or, in other words, the lower half, thereof is wedge-shaped both in width and thickness from its middle portion to its closed endJ Brake-head 1 is also provided with a recess 8, formed by cutting away a portion of the material so that'one end thereof is bifurcated, recess 8 extending longitudinally through the bottom wall of mortise 6 to a position adjacent the middle ortion thereof.- The Walls of mortise 6, as s own in Fig-J6, v are cut substantially parallel from the middle portion thereof to its upper open end, and extending through a transversely-arranged aperture in the rear portion ofbrakehead 1 is a clamping bolt 9, having 'a nut threaded thereon, said clamping-bolt being adapted to'draw the bifurcated ortions of brake-head 1 together, so that t e wallsof the upper portion of mortise 6 will taperin all directions from the middle ortion to its upper open end, the shape t ereof being similar in all respects to the'lower wedge-n shaped portion.

"upper end thereof and intersecting mortisel i,

is a similarly-shaped .key 17, adapted to engage and maintain in position in mortise 14 a wedge-shaped filler-piece 18, as shown in Fig. 1, or the tenon of an attached shoe: As 7c shown in this illustrative embodiment, shoe 10 is provided with a longitudinal groove 19 in its wearing-surface to receive the flange of the wheel and has'a similarly-arranged projection' or rib 20 upon the rear surface thereof which is adapted to-be received When'the shoe is in position upon the brake-head ina depression 21 therein. At this point it may be noted that shoe 10 increases gradually in thickness from its lateral side inwardly to a point opposite the middle portion of the base of tenon 13, {indicated by line d d,) which is in a plane cutting the shoe longitudinally from top to bottom. In other words, any" given line drawn through shoe 10' parallel to the plane indicated by line d d in either di; rectlon towardthelateral sides of the-shoe? Will be of less length-than line d; E and-of less length than any line drawn parallel and} intermediate that line-and in the l'meindif -9o cated by line at =By reason of this"con=: struction shoe 10-"Will be Wornaw'ay com-" 'pletel the wearing occurring first at itslatera edges and later gradually wearing in-- 13, thus providing against portions'ofnthe' shoe being cutaway through wear from the, body portion ofthe shoe. 1 2

The front faces of the head and offthe'sho'eare preferably recessed, so as to form the c'on cave surfaces 11, whichjfit the convex re'a surfaces of the parts mounted thereon;

As shown in the embodiment illustrated Fig. ]1,' key 1'! carried upward, so as to-be flush with the wearing-surfaceof'shoefl0', and* Braki'ng member 10, herein designated shoe, comprised, preferably, by an integral casting designed to cooperate with brakehead 1, has front andrear faces'll and 12,

respectively, upon arcs described by radii equal to the radius of. the are describing brake-head 1 Extending longitudinaily of shoe 1O isa rigid tenon 13,'dovetailed in end section, as shown, and tapering in. every direction toward either end from its middle portion, (denoted'herein byline e e) Tenon 13 is of such size as to be received and fit in mortise 6 of brake-head 1, the lower portion thereof fitting the same closely, Shoe 10 is,

in't'he wearingefac thereof, provided ,With a mortise-14, preferably dovetailedhas showny which ,ta ers" downwardly"? from the middle portion t erein' indicated by line-e e) to;.a' closed end 115,, the 1'1ppc;" 1 portion; .liei'ng comprised by substantially parallel? walls The lower portion ofinortise1-1-4 is' of; such shape and dimensions'as to fitexactlythe "corresponding portion of a tenon=ofa shoe constructed similarly to shoe #10, In an opening 16 substantially dovetail in sha ency oftheinet'al of'which the brake-headis constructed allowing "for the relativefin'ove-f ment of the-"bifurcated members thereof-(lur 111 the..clampilig .-Operation. The shoe *isjl 5 thus held I firmly againstn'movernent by (the? awedge' shaped, walls of the mortise;; coa c'tinglf f l with the op osit'e'ly-rdisposed wedgeshape surfaces of t etenon. H WhenLajieW-ShQe is interlocked in the brake-head, the mortise "the 'weari g-faceof the shoe filled with the wedge-shaped filler-piece 18,? ,hich comes flushwith the wearing-surface; as shown in Figs. 2 and 3, being held securely in plaee bfi e extending transversely of shoe 10, near the wardlyin oppositedirections toward tenon- 2 1 25: pered upper portion of'tenon' 13, the 11-35111-115 means of key 17 driven in the transversely- 1 o 1 extending mortise. Filler-piece 18 and key 1 1 7 wear away with the face of the shoe, and l as both are wider at their bottom than at l their top portion they are maintained in position until completely worn away. When the shoe becomes WOIlI to any be removed from the head by simply unscrewing the nut upon clamping-bolt 9, and i after a new shoe has been clamped therein the worn shoe may lie fastened to the face of mortise of the new shoe, after which a key 17 shoehas its maximum wearing thickness *times be provided for all portions of the 3 gral part, but rather a unit which may be of creased simplicity and efficiency and one we'll jthn wear thereof are free to become detached such shoe by simply sliding the tenon in the l is driven to its seat to retain the same in position. In Fig. 5'for purposes of illustration I have shown a partly-worn shoe attached to the wearing-face of a new shoe, which is in I turn clamped to the head. Inasmuch as the opposite the base of the longitudinally-arranged tenon and as the surfaces of the interfitting part-s diverge from the wearing-surfaces rearwardly, connecting means will at all wearing-surface of the shoe. VVhen the material of aworn shoe which has been mounted upon a new one is completely worn away,'the longitudinally-extending tenon of the old shoe will be retained in position in the recess of the new shoe. In this way the old shoev may be completely worn away, as its tenon; will provide a filler-piece for the wearing-surface of the interposed shoe and will be worn away therewith. It may here be noted that the term shoe or shoe member is used throughout the following claims in a broad sense as "comprehending not merely an inteeither integral or built-up construction. It will accordingly be seen that I have provided a construction characterized by in adapted to achieve the objects of my invention. The wedge-shaped interfitting members insure against the looseningof the parts, as a slight movement of the shoein either di- 5 rection, whether mounted in a brake-head or in another shoe, will only serve to wedge the members more securely together. As the interfitting parts are fitted into each other with a sliding movement, worn shoes may be detached and new ones substituted without disturbing the adjustment of the brakebeam, thus effecting a saving of a large amount of labor and the expense incident thereto. The material of the brake-shoe is entirely worn away, nothing being left to be scrapped or wasted, which results in the maximum utilization of-ma'tcrial. -It will als be seen, as has been hcreinbefore indic, ed, that parts of the shoe at no stage of from the member upon; which they are mounted, and thus drop upon the track. It may also be noted at this point that by reason of the interfitting coi'istr-uctionpf the several parts whereby substantially the entire shoe is positively secured to the member upon which it is mounted all chance ofthe same becoming detached by reason of the breakage of anyof the-parts, such as might occur in constructions in which merely interlocking lugs are employed, is done away uibhp. r I i i The brake-headm'ay, if desired, be made in two independent longitudinal sections de- 7 signed to be clamped together by suitable means instead of being bifurcated, as herein shown.

' As many changescould be made irr't'he above construction and many apparently i widely different embodiments of my invention could be made without departing from the scope thereof, I intend that all matter contained in the above description orshown in the accompanying drawings shall be interpreted as illustrative, and not in a' limiting sense. I desire it also to be' understood' that the language used in the following a claims is intended to coverall of the generic and specific features ofthc'invention herein described, and all statements of the scope of the invention which as a matter of lan guage might be said tofall therebetween.

Having described my invention, what I claim as new, and desire to secure by Letters 9 5 Patent, is- 1. In apparatus of the class desc'ribed,=in combination, a shoe-supporting member prof j vided with a recess having undercut side Walls and shoe mp s' hair of sub- 9s.

stantially interchangeable shoe members, each of which is provided upon its rear sur face with a tenon adapted to fit within said recess and upon its forward surface with a recess adapted to receive a similar tenon.

. 2. in apparatus of the class described, in combination, a shoe-supporting member pro vided with a recess having undercut walls, and a shoe comprising a pair of substantially interchangeable shoe members, each of which i c i is provided upon'its rear surface' with aftenoni" adapted to fit within said recess and upon its forward surface with a recess adapted to receive a similar tenon.

3. In apparatus of the class described, .in n 5 combination, a shoe-supporting member provided with a recess having undercut side walls converging toward one end of the memher, and a shoe comprising a pair otsubstan- 1 tially interchangeable shoe members, each igo of which is provided upon its rear surface with a' tenon adapted to fitwitliin said recess and upon its forward surface with a recess adapted to receive a similar tenon. Q

4-. In apparatus of the class described, in r combination, a shoe-supporting member provided with a recess having undercut side 7 walls converging towardboth ends of the member, and a shoe comprising a pair of substantially interchangeable shoe members,

being; provided upon their for-ward surfaces adapted to receiveL-si milan ward one end thereofand having undercut side walls, and a shoe comprising a pair of IO.

each of which is provided upon its rear surf: face with a tenonadaptedto fit within said 'recessand upon its forward surface with are--v said recess, and means' for clamping the bifur- 7:

cess adapted to receive a similar tenon'. 1

6. In apparatus of the'fcla'ss'described, in

vided' with a recess of decreasing depthqto- 'ward one end thereofan'd havingun'dercut .side walls converging toward one end of the 10 substantially interchangeable shoe members,

,1 each of which is; provided upon its rear sur'- face with a tench adapted to fit Within said :5 recess and 'uponits 'forwardsurfaee with .a

recess'adapted to receive a similartenon.

I 7. In apparatu's'ofthezclass described, in

' combination, a shoegsupporting member projvid'ed with arecess fhaving undercut' side walls converging toward gone end thereof, and a shoe comprising a pair of substantially interchangeable shoe members, each of which is' provided' with a rearsurface ofgeneral convex form ina transverse direction and,

with a' ten on upon said rear surface adapted toifit said recess, said shoe members Wltli @recesses 1 Q '-*Z i v )8. Inga-device ofithe class described, in'

porting member provided with a correspond- .ipglyfshaped mortise, andlnieans adapted to 'elampsaid tenon within said mortise.

' 9%. 'In 'apparatu'sfof the class de -main ,co'mhination, aLs'hoe-si1pportin'g member pro general convex-v. form in a transverse "direc-i tionand atenoniuponsaidlrear surface adapted to lar tenonsm' 110. In a"device of the class describe combination, a brake-shoe having a; rearwardly-projecting member, a brake-head pro:

vi :lcd with a recess adapted to'receive said": member and fit a portion thereof, and means adapted to clamp another portion of said" 5 brake-s eadi -about said member.

substantially interchangeable shoe members,

combination, a shoe-supportingmember pro-v member, and-a shoecomprising a pair of combination, a; braking jmember rovided, I a dovetail tenon the walls of' w ich-oohf verge, toward one end of the member, a sup-- ate-a ointintermediate its ends,- and-a brake e shoe members',1each of I t'within said recess,.- said shoe members beingv provided upon their forward surfaces with recesses adapted toreceive 'mi f "'maining pert-inn r said member.

engagement with saidinember," h r- 1 12.111 a device of thelclassjdsoribed, in

combination, a brake-head: having a recess therein, said brake-headbeing bifurcated through a portionof its. -,e'xt'eiit,-fa brakeshoe having amember designed tofb'eseated in "cated portion: of said brake-head about said membea} 1 13.-In'a" d ev iceT of theiclass described, inj combination, a' brake-headihaving a} recess therein, said brake-head being"{bifu'reated', a

brake-shoe having a member designed to be seated in saidrecess, and'means for clam ing the bifurcated ortion of said brakeead about saidmem er. i- 1 f 14. In a; device of the .class'described', "in

" combination, a brake-sh'de having a projec-l oq ti-on the greatest widthof which is at "a pint intermediate its ends,"and a Zbrake-hea provided wi'th arecess inwhich'a portion; of said; I projection is adapted toifitcloselyka'portion". I of the walls of said re eess*being ;-adapted to 5 be, brought into engagementf -wit *"thei re-f maining portion of said projectionpx '15. In a deviceiofvthe class described; combination, a brake sh'oe having .a! projec L tionthgreatest width; and thickness of I09 whichis at apoint intermediate its ends,- a brake head'providedWith a recess in'whieh Q I a portion of's'aid'projection is'adapted to fit I closely: and ,means for forcing a'portion-of the walls-of said recess into engagement with 10 5; s I

the remaining portion of said projection;

'16.In"a"dev'ice' of the class deseribed, in

combination, -'a brake-shoe provided; with a;

projecting member having itsgreatestwidthi 7 saidmember is adapted. to fit closely, a'portion of the walls of saidrecess being adapted tobe moved into engagement 'viththe remaining portion of said member. (7

17. Ina devic'e of the class described, in combination, a 'bralgeeshoe provided with a" projecting member having its-greatest width i oint intei'm'diateitsends, a brakehaving a recess in which a portion of -at a head ,sa'id member is dapted" tofit closely, and

meansfon clamping a'por'tion of the wallsof said recess; into engagement with the re- 18. a de ee'i of. the -.ela s s' described, in combination," *b rak'e-hea d"pi ovid'edqjwith a 'recess openat -fbne:end and closed at the other, 'a brake-shbe rovided withiarprojeciing member "adapted to be seated in s'aid' recess with'oneiend thereof engaging the closed end I 0 of said recess, and means for contracting a portion of the Walls of said recess into engagement with a portion of said member.

19. In a device of the class described, in combination, a brake-head having a shoe-receiving face, a recess in said receiving-face of greater width at the thereof, said recess being open at one end and closed at the other and being tapered from a point intermediate its ends to the closed end thereof, a brake-shoe having a projecting member shaped similarly to the tapered portion of said recess adapted to be seated therein and engage the closed end thereof,

and means for clamping a-portion of the Walls. of sa d recess into engagement with a portion I of said member.

- 'wardly-directed, lateral surf belng tapered toward either end thereof brake-head provided with 20. In a device of the class described, in

combination, a bifurcated brake-head proyided with a longitudinally-extending recess 1n its rece1v1ng-face and having overhanging walls so that the said recess is "of greater width at the bottom than atthe top thereof,

said recess being tapered from a point inter mediate its length in all directions to a closed end, and a brake-shoe provided with a longi tudinally extending lug one end 'of which is adapted to fit closely in the tapered end of saidrecess, the opposite end being adapted to be clamped between the Walls of said recess by means extending through the bifurcated being tapered toward either end thereof from a point intermediate its ends, a brake-head provided with a mortise one end of which is shaped to correspond with the tapered portion of said tenon, and means for clamping the walls of the opposite end of said recess} intoengagement with the opposite end of said tenon so that they fit closely along the entire contacting surface theieof.

23. In a device of the class described, in

combination, a brake-shoe provided with a longitudinally-extending tenon having out- Wardly-directed, lateral surfaces, said tenon being tapered in width and thickness from a point intermediate its ends toward either end thereof, a brake-head provided with a mort1se one end of which is shaped to correspond with an end of said tenon, and means for bottom than at the top face, a portion of which is sh adapted to receive ithe clamping the walls ofthe opposite end of said I I mortise into engagementwith the opposite end of said tenon.

24. In a deviceofthe class described, in

combination, a brake-shoe providedwith a" longitudinally-extending tenon hav ng out wardly-directed, lateral surfaces, said tenon being tapered in width and thickness from a point intermediate its ends toward eitherend thereof, a bifurcated brake-head provlded with a mortise, the bifurcation therein en tending within said mortise, one endof sa d mortise being shaped to correspond wlth said tenon and having a closed end'toform an abutment for the end thereof, and a clamp ing member extending through the bifurcated portion of said brake-head adapted. to clamp the Walls of said mortise into engagement with said tenon.

25.,A brake-shoe having a wearing-face and a back face formed substantially in parallel relation so that the wearing-face of one shoe will fit the back face of another shoe,

and provided upon its back face witha longitudinally-extending, undercut tenon and upon its wearing-face with a recess adapted f to receive a similar tenon of another shoe.

26. A brake-shoe having front and'rear faces formed substantially upon arcs of equal radii provided upon its rear face with a tenon having undercut side walls and upon its for ward face with a recess adapted to receive and fit about a similar tenon.

27. A brake-shoe provided with wearing and attaching faces formed upon arcs of equal radii, and

provided with a tenon upon.

its attaching-face having outwardly-directed walls and a mortise having receding Walls upon its wearing-face, said mortise being adapted to receive the tenon of another shoe.

V 28. A brake-shoe having back and wearing faces formed upon arcs of equal radii so that the wearing-face of one'shoe may fit about the back face ofanother shoe, and provided witha longitudinally-extending tenon upon.

its back face and a recess -upon its wearingped similarly to a portion of said tenon/said recessibeing shoe, and means adapted saidrecess.

2 9. A brake-shoe having wearing aridvback tenon of another to'close one end of faces formed upon arcs of equal radii so that the wearing-face of one shoe may fit'about the back face ofanother shoe, and. provided with a longitudinally-extendingtenon upon its back face,

similarly to a portion of; said tenon sotlat the same may receive the tenon of another shoe; and means adapted to close theopposite end of said recess.

30. A brake-shoe formed with w caring and and a recess havinga closed end upon its wearing-face, the portion of said recess adjacent the closed end being sha' ed" back faces uipon arcs of equai radii so that the wearingace of one shoe will fit the back face of another shoe, and provided with a taparing projection upon its back face and a tathe back face of one SllOQWlll fit the Wearingface of another shoe, and provided with a recess in its wearing-face having a closed end, the open end of said recess bemg mtercepted by a transversely extending recess, and

gneans extending through said last-ment ioned access to close said first-mentioned recess.

32. In apparatus of the class described, in combination, a shoe-supporting member hav ing formed in its forward surface a recess )rovided with undercut side walls, and a brake-shoe having upon its rear surface a tenon adapted to fit said recess and upon its forward surface with a recess adapted to receive and fit a like tenon upon another shoe.

33. In apparatus of the class described, in combination, a shoe-supporting member having formed in its forward surface a recess provided with undercut sidewalls conver ing toward one end thereof, and a brake-s oe having upon its rear surface a tenon adapted to fit said recess and upon its forward surface with a recess adapted to receive and fit alike tenon upon another shoe.

34. A brake-shoe having in its wearingface a recess in which the attaching part of another shoe is adapted to be received and being provided with a member seated in a transverse recess adapted to engage the attaching part upon another shoe and maintain. said shoes in an interfitted condition.

35. A brake-shoe having in its wearingface a recess in which the attaching part of another shoe is adapted'to be received, said 45.brakeshoe being provided-with a member dovetailed in a transversely-extending recess shoe when the therein adapted to engagea part upon another same is seated in said firstmentioned recess.

36. A brake-shoe having-in its wearing face arecess adapted to receive a filler-piece.

37. A brake-s we having in its wearingface a recess adapted to receive a filler-piece and being provided with 'a recess extending transversely of said first-mentioned recess adapted to receive a retaining-key.

38. In combination, a brake-shoe having in its wearing-face a recess, a wedge-shaped filler-'plece adapted to be received in said recess, and means adapted to maintain said filler-piece in place therein.

39. .In combination,- a brake-shoe-having v in its wearing-face a. recess, a filler-piece adapted to be seated in said recess, and means adapted positively to 'engage'said filler-piece to in saidrecess.

maintain the sari 'e in position v 40.- In combination, a brakej-s'hoe having i piece, and'means located in a recess extendmg. transverselyof said first-mentioned .re-

cess adapted to-maintain s'aidfiller-piece in position in said first-mentioned recess.

41. In combination, a brake-head, abrake shoe provided with means whereby the same may be attached to said brake-head, and a filler-piece located in a recess in said brake-j shoe. p a

42.. In combination, a brake-head, a brakeshoe provided w th a wedge-shaped tenon? upon its rear face adapted to be seated in a recess in the face of said' -'brakehead, a filler-piece located in a recess inthe face of said brake-shoe, and means for retaining said filler-piece in posit-ion therein; i

43. In combination, a brake-head, a brake-v shoe provided w th a tenon upon itsattach-v ing-face adapted to be seated in a.r ecess in said brake-head, said brake-shoe being pm; I vided with a recess inits wearing-face, afillerpiece seated in the recessin said'brake shoe,'. and means adapted'positively to retain said I filler-piece in position therein; I t

44. In combinationga brakeehead, a

shoe 'providedyvith a tenon uponitsfa ac ing-face and having ioutwardlyeproj ti e walls, said tenon beingladapfed to beseated' in a recess in said "brake-shoe, gsaidrecess-being a provided with receding walls, 'said..brake;shoe

being provided with. a, recess; havingjjrece'ding walls upon its I Wearing-face,j;afiller-piece] seated in the recessv inJ said;brake shoe,*and means for retaining 'tion therein.

45. In combination, a shoe having back and-wearingfaces formed upon arcs of equal radiisothat the wearing,

face of oneshoelnay fit about the back-face of another, said brake-shoe :being'provided rake-head, a brake-" with a longitudinally-extending-tenonhpon its back face, and'a longitudinally-extending recess upon-itswearing face, the tenon upon said back' face being adaptedto be received in the recess in said brake-head, the recess in the wearing-face of said shoe being adapted to receive the tenon of another shoe, and means adapted to close one end of sald recess.

46. In combination, a brake head, a brakcshoe formed with back and wearing faces upon arcs of equal radii so that the wearing, face of one shoe may fit the back face of an- 1 other, said shoe being provided withtapering W projection upon its back face' adapted to bel ,5.

received in a similarly-shaped recess in said brakeehead and being further provided with in said re'cess', and means extending trans a taperingrecess in its wearing-face, said last'mentioned recess being closed at one end. and open at the other, a filler-piece ,seatedn;

wearing faces upon verselyjthr'oughthe opening in said recess adapted to retain the therein. 1 i 47. A brake-shoe filler-piece in position an attaching member, said, brake-shoe indinally-ext 3 vex form in a transverse dlrection. 3

rear surfaces for forming a creasing gradually in thickness from its lateral sides to a point opposite said attachmg member.

49. A brake-shoe formed with back and wearing faces of equal radii having a longituending attaching member, said brake-shoe being so constructed as. to gradually diminish in thickness in either direction laterally from a plane extending longitudi nally thereof cutting the middle portionof said attaching member.

' 50. In apparatus of the cases described, in combination, a plurality of substantially in.- terchangeable shoe members, each of 'hich is provided with means upon its front and nection with similar shoe members in fraorrt on at the rear of the same and each of which is provided with a rear surface of a general con- 51. In apparatus of the class described, in combination, a plurality of substantially interchang'eable shoe members, each of which is provided with means upon its front and rear surfaces adapted to form a dovetailed connection with similar shoe members in front or at the rear of the same, and each of which is of a decreasing thickness toward the sides of the shoe.

52. In apparatus of the classdescribed, in combination, a plurality of substantially interchangeable shoe members, each of which is provided with means upon its front and rear surfaces adapted to form a dovetailed connection with similar shoe ."members in front or at therear of the same, and each of whichisof a decreasing-thickness toward the sides of the shoe,

v the lateral walls of said dovetailed connections being converged to- I, ward one end of the shoe.

5 3. In apparatus of'the class described, in combination, a plurality of substantiallyin- I terchangeable shoemembers, each of which is provided with means upon its front and rear surfaces adapted to form a dovetailed COIIDBCUOILWlth similar shoe members in H front or at therear of the same, and each of which is of a decreasing thickness'toward the sides of the shoe, the lateral walls of said dovetailedconnections being converged to-- ward both ends of the shoe.

54. In apparatus of the class described, in combination,- a plurality of substaritiallyinterchangeable' shoemembers, each of which connection with similar shoe members in dove tailed con "tcrch angea ble provided with means u on its front and rear surfaces adapted to; orm a doveta1led connection withj slmilar shoe members. in front or at therearof thesame, the lateral walls of said dovetailed connections converg-.

is provided with means upon -its front and rear surfaces adapted front or at the rear'of the same, thelatera'l walls of said dovetailed connections converging toward both ends of. thecorresponding shoe.

56. In apparatus of the class'described, in combination, a plurality of substantially in'- terchangeablc shoe members, each of which is provided upon one surface with a dovetailtenon oi decreasing thickness toward one end of the shoe and upon its opposite surface with a recess adapted to receive and fit a similar tenon.

57. In apparatus of the class described, in combination, a plurality of substantially inshoe members, each of which is provided upon one siu'face with a dovetail tenon of decreasing thickness toward one of the shoe and upon its opposite surface with a recess adapted to receive and fit a similar tenon, the walls of said tenons beinglconverged toward one end of the shoe.

58. In apparatus of theclass described, in combination, a plurality of substantially interchangeable shoe members, each of which is provided upon one surface with a dovetail tenon'of decreasing thickness toward both ends of the shoe and upon its opposite surface with a recess adapted to form a dovetailed to receive and fit a simi rec lar tenon,the wallsof said tcnons being con versed toward both endsof the shoe.

59. In apparatus of the class described, in combination, a shoe-supporting member provided upon its forward surface with a recess of decreasing depth toward the ends thereof, and, a shoe member provided upon its rear surface with a tenon adapted to fit said reccss.

60. In apparatus walls converging toward each end thereof, and a shoe lnember provided with a tenon adapted to fit said recess.

61. Inapparatus of the class described,in combination, a shoe-supportingmember pro vided with a recess having undercut side walls converging, toward each end thereof and of decreasing depth toward the ends of the shoe, and a shoe member provided with a tenon adapted to fit said recess.

I 62. In apparatus of the class described, in combination, a shoe-supporting member provided with a recess having undercut side of the class described in combination, a shoe-supporting member pro- "vided with a recess having undercut side ends of said shoe members projecting beyond walls, and a shoe coniprising pair ofsubface with a tenon adapted to fit within said recess and upon its forward surface with a recess adapted to receive a similartenon, the

the corresponding tenons. r

and'a shoe comprisinga pair of substantially interchangeable shoe members, each of which 1s PIOVldBCl upon lts'rear surface with a tenon adapted to fitwithin said recess and upon its forWardsu-rfaee with arecess adapted to recelve a slmllartenon,- the ends of sald shoe ing tenons."

members projecting beyond the correspond- 5- Supporting member for a brake-shoe having. 1n Its Wearing-face a recess in which be received, and being provided with a member seated ina transverse recess therein.

adapted to engage \the attaching part upo'n' said shoe and maintain the same in an interfitted condition. 1 65.. A supporting member for a brake-shoe v having inits wearing-facea recess in which 63' In apparatus ofthc class described, in. combination, a shoe-'suppofiingmzmber pro-' vided with a recess having undercut. walls,"

the attaching partof said shoe is adaptedto b'e recelved sald member .bem rovided r with ,Ineans dovetailed [in .a transversely eX- tending recess therein adapted to engage a partof said shoe when the same is seated in I said first m'entioned recess; 1 In testimony whereof I'affix my signature in the presence of two witnesses.

i I I VAN BUREN LAMB.-

, hVitnesses:

J. H. FREEMAN, ROB RT S. BLAIR 

